<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title>实体字符</title>
	</head>
	<body>
		html页面的根标签______&lt;html&gt;&lt;/html&gt;_______ <br />
		&lt;的实体字符是&amplt;
		勾的实体字符是&radic;
	</body>
</html>
